function Canvas(options) {
    let {canvasId} = options || {}
    this.canvasId = canvasId;
    let wrap = document.getElementById(this.canvasId);
    if (!wrap.getContext) throw new Error('您的浏览器暂不支持canvas,请升级浏览器版本')
    this.ctx = wrap.getContext('2d');
    this.drawFillRect = function (x, y, width, height, color) {
        this.ctx.fillStyle = color;
        this.ctx.fillRect(x, y, width, height)
    }
    this.drawStrokeRect = function (x, y, width, height, color) {
        this.ctx.strokeStyle = color;
        this.ctx.strokeRect(x, y, width, height)
    }
}